Heat oven to 350 degrees. Trim meat; cut into serving sized pieces. Pound to 1/2" thickness with meal mallet.
On a sheet of waxed paper, mix flour, salt and pepper. Dip steaks in flou mixture, turning to coat.
In large skillet, melt 1 tablepoon of butter in 2 tablespoons of oil over medium-high heat. Add coated steaks; brown on both sides. Fry in two batches if necessary, adding additional butter and oil.
Arrange browned steaks in 12X8-inch baking pan. Sprinkle with onion. Top each steak with 1 teaspoon packed brown sugar and 1 teaspoon catsup. Sprinkle lightly with basil. Dot the meat in the pan with 1 tablespoon of cut up butter.
Add stock to drippings in skillet. Cook over medium heat for about 1 minute, stirring to loosen any browned bits. Add to baking pan. Cover the pan with aluminum foil.
Bake for about 45 minutes. Remove foil. If meat appears dry, add a small amount of stock or water to pan. Bake until browned on top, about 15 minutes longer.